Reviewed by Oliver Hunt.

        Renamed Finalizer => WeakHandleOwner (in preparation for adding a reachability callback)
        https://bugs.webkit.org/show_bug.cgi?id=57775
        
        Also renamed noFinalizer => emptyWeakOwner, since this is really an
        optimization for a weak owner with empty callbacks.

        * collector/handles/HandleHeap.cpp:
        (JSC::HandleHeap::clearWeakPointers): Updated for renames. Removed
        redundant initialization of m_nextToFinalize. Moved deletion check inside
        weak owner check, since the weak owner can't delete the node if there is
        no weak owner!

        * collector/handles/HandleHeap.h:
        (JSC::WeakHandleOwner::~WeakHandleOwner):
        (JSC::HandleHeap::makeWeak): Updated for renames.

        (JSC::HandleHeap::hasWeakOwner): Changed getFinalizer to hasWeakOwner,
        to clarify this function's role in assertions.

        (JSC::HandleHeap::Node::Node):
        (JSC::HandleHeap::Node::makeWeak):
        (JSC::HandleHeap::Node::isWeak):
        (JSC::HandleHeap::Node::weakOwner):
        (JSC::HandleHeap::Node::weakOwnerContext):
        (JSC::HandleHeap::Node::emptyWeakOwner):
        * interpreter/RegisterFile.cpp:
        (JSC::RegisterFile::globalObjectCollectedNotifier):
        * interpreter/RegisterFile.h:
        * runtime/WeakGCMap.h:
        * runtime/WeakGCPtr.h:
        (JSC::WeakGCPtr::WeakGCPtr):
        (JSC::WeakGCPtr::set): Updated for renames.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@82866 268f45cc-cd09-0410-ab3c-d52691b4dbfc